When running darcs whatsnew non-existant-file, darcs should warn that the file
does not exist/is not recorded, instead of just saying "No changes!", which is
true, but misleading when the filename is a typo.
The following patch updated the status of issue1117 to be resolved:
* resolve issue1117: warn if file does not exist in whatsnew
Ignore-this: 96cb2370609e7acd9d0137725f5e56b5